Alexander Ewald demonstrates how to route CV from a Eurorack module into Bitwig Studio to control software device parameters, using the HW CV In modulator. The workflow is straightforward: connect your module's CV output to an audio interface input, add HW CV In to a device like Polysynth, then select the corresponding input in the modulator's settings.
From there, clicking the mapping icon lets you assign the incoming CV to any parameter. Dragging on a control like filter cutoff sets the modulation depth, so a physical module such as Make Noise Maths can directly drive Polysynth's filter in real time.
Gain and smoothing controls on the modulator let you shape the incoming signal before it hits the parameter, which is useful when the CV range from your hardware doesn't map cleanly to the software control.